| // *************************************************************************************************************************** |
| // * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file * |
| // * distributed with this work for additional information regarding copyright ownership. The ASF licenses this file * |
| // * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance * |
| // * with the License. You may obtain a copy of the License at * |
| // * * |
| // * http://www.apache.org/licenses/LICENSE-2.0 * |
| // * * |
| // * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an * |
| // * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the * |
| // * specific language governing permissions and limitations under the License. * |
| // *************************************************************************************************************************** |
| package org.apache.juneau.http; |
| |
| import org.apache.juneau.annotation.*; |
| import org.apache.juneau.http.annotation.*; |
| |
| /** |
| * Represents a parsed <l>Connection</l> HTTP request header. |
| * |
| * <p> |
| * Control options for the current connection and list of hop-by-hop request fields. |
| * |
| * <h5 class='figure'>Example</h5> |
| * <p class='bcode w800'> |
| * Connection: keep-alive |
| * Connection: Upgrade |
| * </p> |
| * |
| * <h5 class='topic'>RFC2616 Specification</h5> |
| * |
| * The Connection general-header field allows the sender to specify options that are desired for that particular |
| * connection and MUST NOT be communicated by proxies over further connections. |
| * |
| * <p> |
| * The Connection header has the following grammar: |
| * <p class='bcode w800'> |
| * Connection = "Connection" ":" 1#(connection-token) |
| * connection-token = token |
| * </p> |
| * |
| * <p> |
| * HTTP/1.1 proxies MUST parse the Connection header field before a message is forwarded and, for each connection-token |
| * in this field, remove any header field(s) from the message with the same name as the connection-token. |
| * Connection options are signaled by the presence of a connection-token in the Connection header field, not by any |
| * corresponding additional header field(s), since the additional header field may not be sent if there are no |
| * parameters associated with that connection option. |
| * |
| * <p> |
| * Message headers listed in the Connection header MUST NOT include end-to-end headers, such as Cache-Control. |
| * |
| * <p> |
| * HTTP/1.1 defines the "close" connection option for the sender to signal that the connection will be closed after |
| * completion of the response. |
| * For example... |
| * <p class='bcode w800'> |
| * Connection: close |
| * </p> |
| * <p> |
| * ...in either the request or the response header fields indicates that the connection SHOULD NOT be considered |
| * `persistent' (section 8.1) after the current request/response is complete. |
| * |
| * <p> |
| * HTTP/1.1 applications that do not support persistent connections MUST include the "close" connection option in |
| * every message. |
| * |
| * <p> |
| * A system receiving an HTTP/1.0 (or lower-version) message that includes a Connection header MUST, for each |
| * connection-token in this field, remove and ignore any header field(s) from the message with the same name as the |
| * connection-token. |
| * This protects against mistaken forwarding of such header fields by pre-HTTP/1.1 proxies. |
| * See section 19.6.2. |
| * |
| * <ul class='seealso'> |
| * <li class='extlink'>{@doc RFC2616} |
| * </ul> |
| */ |
| @Header("Connection") |
| @BeanIgnore |
| public final class Connection extends HeaderString { |
| |
| /** |
| * Returns a parsed <c>Connection</c> header. |
| * |
| * @param value The <c>Connection</c> header string. |
| * @return The parsed <c>Connection</c> header, or <jk>null</jk> if the string was null. |
| */ |
| public static Connection forString(String value) { |
| if (value == null) |
| return null; |
| return new Connection(value); |
| } |
| |
| |
| private Connection(String value) { |
| super(value); |
| } |
| |
| /** |
| * Returns <jk>true</jk> if the header value is <c>close</c>. |
| * |
| * @return <jk>true</jk> if the header value is <c>close</c>. |
| */ |
| public boolean isClose() { |
| return eqIC("close"); |
| } |
| |
| /** |
| * Returns <jk>true</jk> if the header value is <c>keep-alive</c>. |
| * |
| * @return <jk>true</jk> if the header value is <c>keep-alive</c>. |
| */ |
| public boolean isKeepAlive() { |
| return eqIC("keep-alive"); |
| } |
| |
| /** |
| * Returns <jk>true</jk> if the header value is <c>upgrade</c>. |
| * |
| * @return <jk>true</jk> if the header value is <c>upgrade</c>. |
| */ |
| public boolean isUpgrade() { |
| return eqIC("upgrade"); |
| } |
| } |